We need basic "cancel / reject / accept" elicitations requiring only confirmation / reject with no data

[owengo]

Initial Checks

• I confirm that I'm using the latest version of MCP Python SDK
• I confirm that I searched for my issue in https://github.com/modelcontextprotocol/python-sdk/issues before opening this issue

Description

It would be nice to create very simple cancel / reject / accept elicitations like this:

# Elicitation schemas for user confirmation
class CreateDocumentConfirmation(BaseModel):
 """Schema for create document confirmation."""
 #confirm: bool <== We don't need this, it creates a useless box to the click for the client

An easy fix in elicitation.py would be:

 if result.action == "accept" and result.content:
 # Validate and parse the content using the schema
 validated_data = schema.model_validate(result.content)
 return AcceptedElicitation(data=validated_data)
 elif result.action == "accept":
 validated_data = schema.model_validate({})
 return AcceptedElicitation(data=validated_data)
 elif result.action == "decline":
 return DeclinedElicitation()
 elif result.action == "cancel":
 return CancelledElicitation()
 else:
 # This should never happen, but handle it just in case
 raise ValueError(f"Unexpected elicitation action: {result.action}")

Note that the typescript sdk allows this behavior:

The behavior is possible with the typescript sdk:

 const result = await server.server.elicitInput({
 message: `${confirmationMessage}`,
 requestedSchema: {
 type: "object",
 properties: {
 },
 required: []
 }
 }); 
 if (result.action === "accept") { 
 log.warn(`User accepted usage of ${toolName}`, {
 user: userEmail,
 });
 return true;
 } else {
...

Example Code

from mcp.server.fastmcp import Context, FastMCP

# Elicitation schemas for user confirmation
class CreateDocumentConfirmation(BaseModel):
 """Schema for create document confirmation."""

mcp = FastMCP("test-elicit")

@mcp.tool()
async def create_document(
 ctx: Context[ServerSession, None],
 name: str,
 html_content: str
) -> Dict[str, Any]:
 """Create a new document"""
 user_email = await check_user_auth(ctx)
 start_time = time.time()
 
 try:
 # Request user confirmation via elicitation
 try:
 await ctx.info(f"Requesting confirmation for document creation: {name}")
 confirmation_result = await ctx.elicit(
 f"Are you sure you want to create document '{name}'?",
 CreateDocumentConfirmation
 )
 
 await ctx.info(f"Confirmation result: {confirmation_result.action}")
 if confirmation_result.action != "accept":
 return {"result": f"Document creation cancelled by user"}
 
 except Exception as elicit_error:
 await ctx.error(f"Elicitation failed: {elicit_error}")
 return {"result": f"Document creation cancelled due to confirmation error"}
 ...


So currently this example *does not work* because of the validation issue , we have a: ValueError(f"Unexpected elicitation action: {result.action}") ( where result.action == "accept" ) .

Python & MCP Python SDK

python3.11
mcp-1.13.0

[maxisbey]

closing as fixed in #1285